How did they do the special effects for toi & I???Like Harry and Zayn's special effect for example...when Harry turned around Zayn appeared.So please tell me how they did those special effects.

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Oh toi mean when they all morphed into each other.That part was amazing and I think the director and editor must have used a special type of computer to make the guy's images,I'm not really sure.And if toi want to know what those La Reine des Neiges figures of them were,they're called freeze frames.